﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.Data;
using Ylh.DBUtility;

namespace UpdateDatabase
{
    public class UpdateDatabase201211
    {
        /// <summary>
        /// 用来获取脚本执行情况
        /// </summary>
        public List<string> list = new List<string>();
        /// <summary>
        /// 全局变量，装载语句执行后返回信息
        /// </summary>
        public string Message;

        public List<string> ExecuteSQL2012111501(bool IsExcute, string constr)
        {
            list = new List<string>();
            if (IsExcute)
            {
                string SQL = @"if exists (select 1 from syscolumns where id=object_id('TbCustFollow') and name='FollowType')
ALTER table dbo.TbCustFollow
alter column FollowType varchar(50)";
                Message = SqlHelper.ExcuteQueryReturnMessage(constr, SQL, CommandType.Text);
            }
            list.Add("修改跟进类型字段长度:" + Message);
            return list;
        }


        public List<string> ExecuteSQL2012112301(bool IsExcute, string constr)
        {
            list = new List<string>();
            if (IsExcute)
            {
                string SQL = @"if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[sp_PageView]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
-- 删除存储过程
drop procedure [dbo].[sp_PageView]";
                Message = SqlHelper.ExcuteQueryReturnMessage(constr, SQL, CommandType.Text);
            }
            list.Add("删除存储过程[sp_PageView]:" + Message);
            return list;
        }


        public List<string> ExecuteSQL2012112302(bool IsExcute, string constr)
        {
            list = new List<string>();
            if (IsExcute)
            {
                string SQL = @"
--TOP n 实现的通用分页存储过程

CREATE PROC [dbo].[sp_PageView]

@tbname     sysname,               --要分页显示的表名

@FieldKey   nvarchar(1000),      --用于定位记录的主键(惟一键)字段,可以是逗号分隔的多个字段

@PageCurrent int=1,               --要显示的页码

@PageSize   int=10,                --每页的大小(记录数)

@FieldShow nvarchar(1000)='',      --以逗号分隔的要显示的字段列表,如果不指定,则显示所有字段

@FieldOrder nvarchar(1000)='',      --以逗号分隔的排序字段列表,可以指定在字段后面指定DESC/ASC 用于指定排序顺序

                                          

@Where    nvarchar(1000)='',     --查询条件

@PageCount int OUTPUT             --总页数

AS

SET NOCOUNT ON

--检查对象是否有效

IF OBJECT_ID(@tbname) IS NULL

BEGIN

    RAISERROR(N'对象不存在',1,16,@tbname)

    RETURN

END

IF OBJECTPROPERTY(OBJECT_ID(@tbname),N'IsTable')=0

    AND OBJECTPROPERTY(OBJECT_ID(@tbname),N'IsView')=0

    AND OBJECTPROPERTY(OBJECT_ID(@tbname),N'IsTableFunction')=0

BEGIN

    RAISERROR(N'不是表、视图或者表值函数',1,16,@tbname)

    RETURN

END

 

--分页字段检查

IF ISNULL(@FieldKey,N'')=''

BEGIN

    RAISERROR(N'分页处理需要主键（或者惟一键）',1,16)

    RETURN

END

 

--其他参数检查及规范

IF ISNULL(@PageCurrent,0)<1 SET @PageCurrent=1

IF ISNULL(@PageSize,0)<1 SET @PageSize=10

IF ISNULL(@FieldShow,N'')=N'' SET @FieldShow=N'*'

IF ISNULL(@FieldOrder,N'')=N''

    SET @FieldOrder=N''

ELSE

    SET @FieldOrder=N'ORDER BY '+LTRIM(@FieldOrder)

IF ISNULL(@Where,N'')=N''

    SET @Where=N''

ELSE

    SET @Where=N'WHERE ('+@Where+N')'

 

--如果@PageCount为NULL值,则计算总页数(这样设计可以只在第一次计算总页数,以后调用时,把总页数传回给存储过程,避免再次计算总页数,对于不想计算总页数的处理而言,可以给@PageCount赋值)

IF @PageCount IS NULL

BEGIN

    DECLARE @sql nvarchar(4000)

    SET @sql=N'SELECT COUNT(*)'

        +N' FROM '+@tbname

        +N' '+@Where

		exec(@sql)
    --EXEC sp_executesql @sql,N'@PageCount int OUTPUT',@PageCount OUTPUT

    --SET @PageCount=(@PageCount+@PageSize-1)/@PageSize

END

 

--计算分页显示的TOPN值

DECLARE @TopN varchar(20),@TopN1 varchar(20)

SELECT @TopN=@PageSize,

    @TopN1=(@PageCurrent-1)*@PageSize

 

--第一页直接显示

IF @PageCurrent=1

    EXEC(N'SELECT TOP '+@TopN

        +N' '+@FieldShow

        +N' FROM '+@tbname

        +N' '+@Where

        +N' '+@FieldOrder)

ELSE

BEGIN

    --处理别名

    IF @FieldShow=N'*'

        SET @FieldShow=N'a.*'

 

    --生成主键(惟一键)处理条件

    DECLARE @Where1 nvarchar(4000),@Where2 nvarchar(4000),

        @s nvarchar(1000),@Field sysname

    SELECT @Where1=N'',@Where2=N'',@s=@FieldKey

    WHILE CHARINDEX(N',',@s)>0

        SELECT @Field=LEFT(@s,CHARINDEX(N',',@s)-1),

            @s=STUFF(@s,1,CHARINDEX(N',',@s),N''),

            @Where1=@Where1+N' AND a.'+@Field+N'=b.'+@Field,

            @Where2=@Where2+N' AND b.'+@Field+N' IS NULL',

            @Where=REPLACE(@Where,@Field,N'a.'+@Field),

            @FieldOrder=REPLACE(@FieldOrder,@Field,N'a.'+@Field),

            @FieldShow=REPLACE(@FieldShow,@Field,N'a.'+@Field)

    SELECT @Where=REPLACE(@Where,@s,N'a.'+@s),

        @FieldOrder=REPLACE(@FieldOrder,@s,N'a.'+@s),

        @FieldShow=REPLACE(@FieldShow,@s,N'a.'+@s),

        @Where1=STUFF(@Where1+N' AND a.'+@s+N'=b.'+@s,1,5,N''),   

        @Where2=CASE

            WHEN @Where='' THEN N'WHERE ('

            ELSE @Where+N' AND ('

            END+N'b.'+@s+N' IS NULL'+@Where2+N')'

 

    --执行查询

    EXEC(N'SELECT TOP '+@TopN

        +N' '+@FieldShow

        +N' FROM '+@tbname

        +N' a LEFT JOIN(SELECT TOP '+@TopN1

        +N' '+@FieldKey

        +N' FROM '+@tbname

        +N' a '+@Where

        +N' '+@FieldOrder

        +N')b ON '+@Where1

        +N' '+@Where2

        +N' '+@FieldOrder) 

END";
                Message = SqlHelper.ExcuteQueryReturnMessage(constr, SQL, CommandType.Text);
            }
            list.Add("增加分页存储过程:" + Message);
            return list;
        }







    }
}
